For when the Thebans expelled the Spartan garrison and liberated their city, he charged them with the murder of Archias and Leontidas, who were really tyrants, though polemarchs in name, and levied war upon them.
Edition :
Plutarch Lives V: Agesilaus and Pompey, Pelopidas and Marcellus, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 87), Harvard University Press: Cambridge/MA - London 1961 (first ed. 1917).